Factors Definition and 428 Threads

I'm currently doing a spectroscopy lab where you use a scintillator and Cs-137 to obtain a Cs-137 spectrum. I calibrated this spectrum using the known gamma energy for Cs-137 at 662 Kev at the photo peak. I am now trying to use this calibration for a Co-60 spectrum. The problem is that when I...

Homework Statement The problem: Derive (3.3) without reference to (2.3) or (2.1). (2.1): F/P = (1 + i)^n (2.3): F/A = [(1 + i)^n – 1]/i (3.3): (F/A, i%, n) = (F/A, i%, n_1) + (F/P, i%, n_1) + (F/P, i%, n_1 + 1) + . . . + (F/P. i%, n – 1) (n > n_1) The solution (which also...

Show that for $a >0$ and $b \ge 0$, $$\int_{0}^{\infty} e^{-a^{4}x^{2}(x^{2}-6b^{2})} \cos \Big(4a^{4}bx(x^{2}-b^{2}) \Big) \ dx = \frac{e^{a^{4}b^{4}}}{4a} \Gamma \left( \frac{1}{4} \right) $$

Homework Statement what factors affect the size of the pressure at a point in a static fluid? Homework Equations The Attempt at a Solution

Hello All, I'm currently working through a scenario in which the following occurs : An object of mass M1 (kg) approaches a rotating wheel at a speed of S1 (m/s) along a belt The belt is at an angle Th1 (degrees) to the horizontal axis The rotating wheel has a linear velocity equal to S1...

Other than molecular weight, what are the factors which affect the melt flow rate of thermoplastic?

In Morse & Feshbach (P512 - 514) they show how 10 different orthogonal coordinate systems (mentioned on this page) are derivable from the confocal ellipsoidal coordinate system $(\eta,\mu,\nu)$ by trivial little substitutions, derivable in the sense that we can get explicit expressions for our...

Homework Statement Give one reason that a 4th degree polynomial function might not have four factors. Homework Equations (This was a test question) The Attempt at a Solution I wrote that a 4th degree polynomial function might contain an irreducible quadratic, such as...

In Ox/Red reactions there 3 factors that can speed up a reaction between 2 compounds: the first being a greater concentration, which is pretty easy to comprehend. What I don't understand is how heat affects the speed of a reaction ( at a micro level) and how is adding a third component to...

Is this line of thought correct? Please correct me where I´m wrong. Will this way of finding prime factors work when A is any integer? Is there a proof for this or a proof that is closely related? Is there a way to do it that requiers less iterations? It has to be a method that requires...

Hi all, To be more specific, do the following factors increase the time taken for a drug to reach steady-state? Increased frequency of drug administration Increased dosage of drug administration If not, please explain why that is the case. Many thanks, Jay

i understand the linear case... example.. #/{(x+5)(x-4)} ----> A/(x+5) + B/(x-4) but i don't understand this.. example.. #/{(x^2+3)(x^2+9)}------>(Ax+B)/{(x-√3)(x+√3)} + (Cx+D)/(x^2+9) first of all... (x-√3)(x+√3)= x^2-3, which is nowhere in the original equation.. it's...

Here is the question: Here is a link to the question: Show that the given equation is not exact and find the right integrating factor to make this equation exact? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

Sorry if I fill any of this out incorrectly, this is my first post. Homework Statement Basically, we are told to calculate gravity with the use of a pendulum. Now, this part I understand, alter the length, record the period at each length, calculate averages and substitute these averages into...

Hi I have a Solenoid(No core) and a small magnet that is stationary in it. The Solenoid is powered off/on. What would cause Counter-EMF if the Solenoid is on/off? Only the motion of the magnet? What are other factors would generated EMF in my coil? Other than the magnet's motion + the...

Hey, just trying to get my head around the logic of this. I can see that if composition factors are cyclic then clearly the group is soluble, since there exists a subnormal series with abelian factors, but I am struggling to see how the converse holds. If a group is soluble, then it has a...

Given a large number N, do we have any formula to find the number of prime factors and their sum like τ(N) and σ(N) functions? CONDITION: One should not list the factors of N or is not allowed to factorize N since afterwards it would be just a matter of counting and addition

So here is my problem: I'm very bad when using coordinates others than cartesian ones, and I know taking Mechanics of Lagrange and Hamilton and I fin difficult to find the velocities expressions in curvilinear coordinates. So here is my question: is there anyway to relate the scale factors...

The girl says that the number 20 has a colour that is a mix of the colours of 20's factors. I find this interesting, because I always thought arithmetic is imaginary, right? If she didn't learn basic arithmetic, would 20 have had the same colour? Or would 20 have the same colour, but to her, the...

Homework Statement The test for an illness is 90% accurate (meaning it gives a positive result 90% of the time if the patient has gingivitis and a negative reading 90% of the time if the patient doesn't). 4% of all people have this illness. a) calculate the probability the test will be...

Here is the question: Here is a link to the question: Integrating Factor Help Please!? - Yahoo! Answers I have posted a link there so the OP can find my response.

1. Homework Statement [/b] Prove that the number 2^{2^{n}} - 1 has at least n distinct prime factors. Homework Equations Seems like I'd have to use Fermat numbers and its properties to solve this question. F(n) = 2^{2^{n}} + 1 F(n) = (F(n-1) - 1)^{2} + 1 F(n) = F(0)*F(1)*...*F(n-1) +2...

Do you know chemtrails? http://en.wikipedia.org/wiki/Chemtrail_conspiracy_theory I want know more about it! Please, help me. I want scientifically prove it is condensing lines to my friends. I know this is just condensation lines for aircraft. However, how do I prove them? Is there any...

A Theorem in our textbook says... If R is a PID, then every finitely generated torision R-module M is a direct sum of cyclic modules M= R/(c_1) \bigoplus R/(c_2) \bigoplus ... \bigoplus R/(c_t) where t \geq 1 and c_1 | c_2 | ... | c_t . There is an example from our textbook that I...

Homework Statement Suppose G and F are groups and GxF is isomorphic to G'xF', if G is isomorphic to G', can we conclude that F is isomorphic to F'? Homework Equations The Attempt at a Solution I'm trying to give a proof using the first isomorphism theorem (using that GxF/Gx(e) is isomorphic to...

I came across this question in my assignment asking this and i am not sure if they represent activators or repressors because the question jus stated that "Oct 4, Sox 3 are transcription factors that are present in stem cells only. Explain what type of transcription factors they represent."...

Homework Statement The conductivity of a material depends on a) Resistance(R) b) Area of cross section(A) c) Length(L) d) Resistivity(ρ) Homework Equations The Attempt at a Solution The formula for Resistivity is given by ρ = AR/L and Conductivity(σ) being the reciprocal of...

I'd like to know what is their main purpose. Is it to regulate transcription by modifying chromatin?

Hey again, I have a question on a couple of things related to feynman diagrams but also the relativistic scalar propagator term. First of all, this interaction: The cross represents a self-interaction via the mass and characterised by the term: -im^2, is this just some initial state...

I have a question concerning the speed of propagation of a traveling wave along a cable. If I have a cable and I move one end in a direction perpendicular to that of the length of the cable, it will generate a wave/pulse which will propagate along the cable with some speed. I imagine this speed...

Homework Statement I am trying to prove the following: Let G be a finite group and let \{p,q\} be the set of primes dividing the order of G. Show that PQ=QP for any P Sylow p-subgroup of G and Q Sylow q-subgroup of G. Deduce that G=PQ. Homework Equations The set PQ=\{xy: x \in P \text{ and }...

Whenever I'm given a SDE problem that requires us to multiply both sides by an "integrating-factor", it's always given to us as a *Hint*. I would like to know how to come up with these integrating factors. Here's some examples: 1) For the mean-reverting Ornstein-Uhlenbeck (OU) SDE dX_t =...

Homework Statement This is a practice problem for a test on Laplace transforms Find L^-1[ (9s^3+17s^2+66s+45) / (s^2+9)(s+2)^2 ] (L^-1 = inverse laplace transform) Homework Equations From Laplace transform tables: L^-1[ 1 / s-α ] = e^αt L^-1[ s / s^2+ω^2 ] = cos(ωt)...

hello! I would like to know the factors that determine the electronegativity of a specific atom inside a specific molecule inside a specific solution, under specific environment situation I also would like to know what does electronegativity determines, eg. pKa, formation of hydrogen...

My book discusses the oscillations of systems for small pertubations around an equilibrium point. By considering taylors expansions of the potential and kinetic energy they are led to a set of equations for the amplitude factors. I have attached the crucial lines as a picture. My question is...

Form factors in QCD are given in following form "f(q^2)=f(0)/(1-q^2/m^2)". This expression has a pole at q=m. How do we plot these form factors vs center of mass energy and deal with the pole.

I have a theory that i need to prove but I am not quite sure how to mathematically prove that it is true. Theory: When you square a rational number, each of the prime factors has an even exponent. For example, 10 --> If i square 10, which is a rational number, =10^2 =(5^2 x 2^2)...

hello! I want to know which factors determine the strength of interactions between two atoms (which both or one or none can be a part of a bigger molecule) thanks

Homework Statement Prove if m/n has a repeating decimal expansion of period k, and n has no repeated prime factors, then some prime factor of n divides 10k-1 and no number of the form 10j-1 for 1 ≤ j < k Homework Equations The Attempt at a Solution I know that if a decimal...

It was given in my school textbook that large body size, small population size, low reproductive rate, feeding at high trophic levels, fixed migratory roots and habitats and localised and narrow range of distribution are the characteristics susceptible to extinction. I don't understand how...

Hi, I was wondering, what are the governing factors that control how loads are powered by circuits? If a 300hp motor is connected to Source A, Source A will supply 300hp of power at whatever the specified voltage is. But at the atomic/subatomic level, what really determines how that power...

Homework Statement I'm reading a chapter out of Elem. DE 6th Edition by Rainville and Bedient (Ch 4 pg 61) titled integrating factors found by inspection. To explain it, the authors start with an equation, which is grouped to become: y dx + x dy + x^3y^2 dy = 0 which then becomes...

Hi everyone. I've been having this discussion with a pal regarding what affects the grip of a motorcycle's tires when turning and I was hoping someone in here could enlighten us :) So, we have a motorcycle that is making a turn at a constant speed and leaned in an angle. How do you...

Hello Physics Forum Members, This is my first post. I am an executive who needs help with something that will likely be a very simple matter to the majority of you and I simply didn't trust a resource like Yahoo! Answers. My challenge is to come up with a pricing plan for a new product...

Hi everyone, Can someone please tell me how to find the factors of the below quadratic equation? 3x^2 - 9x + 4 = 0 I had already tried to find them by using the below method and wasn't able to continue further because of I do not understand. Huygen (3x^2 - 7x + 4) -2x = 0 (3x-4)(x-1)-2x=0

I read that reduced/low penetrance occurs due to environmental and genetic factors. Could someone state such factors and if possible also provide examples. Cheers!

Homework Statement Simplify the following expression: x3(1-x2) / x(x-1) Homework Equations The Attempt at a Solution I know that the top can be factored to x3(1-x)(1+x) to give x3(1-x)(1+x) / x(x-1) . However, after this step I seem to just go round in circles. I got an...

we know as per uncertainity, (px-xp)>=h/4(pie)...ie can px-xp take any value which is more than h/(4(pie))..can it be infinite also.? On what factors do this extend of greatness depend on.?

Say we have a rational function P(x)=(x^2-3x-4)/(x-4)=[(x+1)(x-4)]/(x-4) I'm a little confused as to why the (x-4) doesn't cancel out. It graphs the same as y=x+1 for x≠4. I feel like I'm missing something from the order of operations.

Homework Statement What does it mean physically if Q < 1 for a particular circuit? What would happen, for instance, if a switch were suddenly closed which completed the circuit by a wire rather than the ac supply? Homework Equations I've already derived the equation for Q (the...